Distributed stray capacity parametron devices



5 v April 14,1970 1 A 'Yu H TA" EIAL 7 3,506,842 DISTRIBUTED sum CAPACITY PARAMETRON nnvxcns' Filed Aug. a. 1967 INVENTORS Yu HATA BY Hn'zom FUJISHIMA m4, MM, mu (0M Arrvs,

United States Patent 3,506,842 DISTRIBUTED STRAY CAPACITY PARAMETRON DEVICES Yu Hata and Hiroki Fujishima, Tokyo, Japan, assignors to TDK Electronics Company, Limited, Tokyo, Japan, a corporation of Japan Filed Aug. 8, 1967, Ser. No. 659,176 Claims priority, application Japan, Aug. 13, 1966, 41/ 53,066 Int. Cl. H01f 27/42 U.S. Cl. 307-88 2 Claims ABSTRACT OF THE DISCLOSURE A distributed stray capacity parametron device comprising two concentric, closely parallel spiral coils wound in the same direction, each of the coils being open at the center, beginning part of the spiral and having a ferromagnetic wire passing through the open center, and there being a coupling circuit connecting the outer ends of the coils.

This invention relates to improvements in distributed stray capacity parametrons.

If the parametron which has been already suggested by the present inventors in which the distributed stray capacity of an oscillating winding is used as a resonance capacity in the dual three-beat excitation, such parts as the condenser and resistor can be eliminated. Further, a so-called three-dimensional parametron circuitry wherein a plurality of such parametrons are positioned on a copper wire deposited a ferromagnetic film uniformly on all of the surface and these oscillating windings are coupled by using a printed board with spiral coils etched on the surface has many features of low cost, easy manufacturing, small size and so on. But, in such structure, each element is required high dimensional precision and it is not always easy to get such high dimensional precision for the relative positions of the oscillating winding and coupling circuit, for example, within $0.05 mm. Further, the packing density in the vertical direction will be restricted by the winding width of the oscillating windings along the core. The oscillating winding is wound on an insulating pipe for exchangeability of ferromagnetic film core easy and has a feature that no connection of the beginning and end of the winding is needed. But an independent coupling coil (spiral coil) is separately required for the coupling with the coupling circuit and the formation must be such that relative positions in which the electromagnetic coupling of these two kinds of coils is uniform may be kept. The present invention has been suggested to eliminate the above mentioned defects.

An object of the present invention is to economically provide a novel device wherein an independent oscillating wiring is eliminated in the coupling coil so that the reliability may be high and the packing density may be remarkably high.

The present invention is characterized by using only one spiral coil which is simultaneously an oscillating winding and a coupling coil so that the distributed stray capacity distributed in the spiral coil may be made a resonance capacity and the oscillating current may be taken out in the coupling circuit directly as a coupling current.

In FIGURE 1 showing a distributed stray capacity parametron of the present invention, '(A) is a sectioned view and (B) is a perspective view of a combined oscillating circuit and spiral coil.

FIGURE 2 shows an equivalent circuit,

FIGURE 3 shows another embodiment of the present invention.

FIGURE 4 shows the formation of a distributed stray capacity parametron of the present invention.

FIGURE 1 shows an embodiment of the present invention wherein spiral coil 1 and 1' are formed on the respective surfaces of an insulator plate 2. Such spiral coil can be made by applying a conventional printed board manufacturing technique. The spiral of the spiral coil is positioned in the same plane as of the insulator plate 2. The center end 3 of the spiral coil is open on both surfaces and is not connected with anything.

In the center of the spiral coil is a hole 5 through which a ferromagnetic wire 4 can pass so as to be vertical with the surface. The spiral coil is wound so as to gradually increase in the diameter outward from the periphery of said hole 5 and is led at the outermost end to an input coil which is a coupling circuit by the same printed wiring. Both surfaces of the print are paired. The input coil is connected in series by one-turn winding though in a different direction in response to the respective determined polarity and is passed at the end through a through-hole 6 so that the printed wirings on both surfaces may be connected with each other. The thus formed spiral coils on both surfaces simultaneously share the following four actions:

(a) .The spiral coil acts as a self-inductance required to make branching possible specifically on its outer periphery so that the output current may be constant in necessity for respective variety of the load.

(b) v The spiral coil acts as a coupling winding with the input coil as a whole.

(c) Specifically the inside of the spiral coil acts as a coupling winding with the ferromagnetic wire.

(d) The stray capacity present between both surfaces of the spiral coil acts as a resonance capacity for the oscillation of the parametron.

Now, the resonance circuit of the spiral coil of the present invention is shown in the most fundamental form in an equivalent circuit in FIGURE 2. Therein, 1 is an inductance of the upper coil, 1' is an inductance of the lower coil, 7 is the inside spiral coil, 8 is the outside spiral and 9 is a load, If the load is made to be of a value close to shorting for the output of the outside coil, the oscillating current will be able to be effectively led as a coupling current directly to the load. Further, the self-inductance of the outside spiral coil will act rather as a part of the load of the oscillating electromotive force. If it is selected to be of a value well larger than of the load, it will be possible to reduce the fluctuation of the oscillating current by the number of branches. As the inductance varying by excitation is mostly of the inside coil and the outside coil is substantially connected to the shorting line, the oscillating voltage will be the highest at the innermost open end, therefore the stray capacity contributing to the resonance and ranging over both surfaces of the inside coil will mostly act. The entire coil will also act directly as a coupling coil for the coupling with the input coil.

According to such principle, it is possible to form a parametron of a spiral coil 1 on one surface and a plane electrode 10 provided with such cut 10' as is shown in FIGURE 3 in a part on the other surface. In such case, the plane electrode 10 on the lower side will act as an electrode for forming an electrostatic capacity with the spiral coil 1 on the upper side and will be simultaneously an input coil.

Another parametron according to such principle can be formed by shorting the spiral coil at the center end through a hole or the like, opening it on the outer periphery so as to be used merely as an oscillating coil and coupling it with a separately provided coil.

It is needless to say that, in case a spiral coil is to be used merely as an oscillating coil, it may be opened at the center end and shorted at the outer peripheral end.

As described above, according to the present invention, it is possible to form any parametron circuit of a coupling circuit including a spiral coil formed on a printed board and a ferromagnetic wire. As, for example, in a conventional parametron wherein several layers of oscillating winding are closely parallelly wound on a ferromagnetic material so that oscillation may be made by using the distributed stray capacity of the windings and ferromagnetic film as a core to utilize the resonant circuit of parametron, there is no independent oscillating winding and, in any spiral coil arranged on the ferromagnetic wire, the oscillating coil and output coil are the same, therefore, the output will be quite uniform and no high precision will be required for the relative positions of the parts required for the respective elements. Further, the spiral coil is so easy to uniformly make by photographic etching process or the like that the uniformity of the oscillating characteristics will be more remarkably increased than in the case of separately making an oscillating coil. As the distributed stray capacity present in the spiral coil is determined by the area of the opposed coils and the distance between the front and back, by selecting the thickness and dielectric constant of the printed base plate, it is possible to comparatively freely determine the resonance capacity for the spiral coil of formly on the surface of a copper wire of a diameter of 0.5 mm. is reciprocated through a hole in the center of the spiral coil by being turned. The parametron oscillating current when excited by a high frequency current of a frequency of 4 mHz. and a direct bias current is about 10 milliamperes (peak-peak). The coupling attenuation between the input coil and the spiral coil is about 30 decibels. The ferromagnetic permalloy plate for shielding the undesirable coupling in the vertical direction of the ferromagnetic wire is 0.1 mm. thick and has two large and small holes. Such plates are alternately laminated according to the respective exciting phases. FIGURE 4 shows a case that one printed board is used for coupling the same shape, that is, for the same inductance. Therefore, the design is very easy. Further, if the printed plate is made thin, it will be possible to remarkably increase the packing density in the vertical direction of the film core. As the parts forming the parametron are only the ferromagnetic wire and printed board, its reliability is very high. As described above, as no part in relation to constructing an element beside the wire and board is necessary, the position of the spiral coil in the axial direction for the ferromagnetic wire is quite free. Therefore, in forming a three-dimensional circuit by assembling this parametron, it is very simple that the ferromagnetic plates for the shielding in the direction of the vertical axis may be piled up between printed board and the ferromagnetic wires may be inserted through holes made after the piling up.

Further, the film cores and spiral coils which are only of the components are automatically in fixed positions and therefore need no dimensional precision. The number of the parts is so small that the economy and reliability are high and the mass-production is easy.

An embodiment of the present invention is shown in FIGURE 4 wherein 4 is a ferromagnetic wire, 11 is a spiral coil, 12 is an input coil and 13 is a permalloy plate. The spiral coil 11 and the input coil 12 are made of a printed board.

A copper foil of a thickness of 35 clad on each surface of an insulator plate of a thickness of 0.1 mm. and a dielectric constant of 5 is etched to form a spiral coil having on one side 15 turns of a width of 150g, a gap distance of 150 an inside diameter of 2.5 mm. and an outside diameter of 10 mm. A ferromagnetic wire made by forming permalloy of a thickness of about 1.1g uniof each parametron. It is needless to say that any majority decision circuit can be formed by arranging a plurality of such boards.

The permalloy plates and printed boards are piled up in the order shown in the drawing by properly arranging such washers as will keep a fixed distance between them and using a jig or the like so that the all may be piled up cubically and are all dipped into a plastic adhesive to be fixed.

It can be easily understood from the known knowledge to cubically form a parametron circuit by such method.

As one parametron is in a configuration of a pitch of 4 mm. in the vertical direction and a pitch of 14 mm. in the longitudinal and lateral directions, the packing density will be about 0.8 cc./parametron and an arithmetic unit for a small calculatnig machine usingab out 1500 parametrons will be of a size of only x 220 x 50 What is claimed is:

1. A distributed stray capacity parametron device com prising two spiral coils in the same direction opposed parallelly and closely to each other in a concentric position, each of said spiral coils being opened in the center beginning part of the winding and connected with a coupling circuit at the end of the winding and a ferromagnetic wire passing through the center of said spiral coils so that said ferromagnetic wire may be excited by the current of a frequency resonating with a distributed capacity present in said spiral coil.

2. A distributed stray capacity parametron device comprising a spiral coil, a plane electrode opposed to the surface of said spiral coil, said coil being opened in the beginning part of the winding and connected with a coupling circuit at the end of the winding, said coupling circuit being connected on the other side with said plane electrode, said plane electrode being provided with a slit, a ferromagnetic wire passing through the center of said spiral coil and the center of the slit provided in the plane electrode so that said ferromagnetic wire may be excited by the current a frequency resonating with a distributed capacity between said spiral coil and plane electrode.

No references cited.

JAMES W. MOFFITT, Primary Examiner 

